linux-kernel - Re: [PATCH] irq: Add a new IRQF_ACK_BEFORE

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Date:	Thu, 13 Mar 2014 17:24:20 +0100 (CET)
From:	Thomas Gleixner <tglx@...utronix.de>
To:	Hans de Goede <hdegoede@...hat.com>
cc:	Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
	LKML <linux-kernel@...r.kernel.org>,
	Carlo Caione <carlo.caione@...il.com>,
	Russell King <linux@....linux.org.uk>
Subject: Re: [PATCH] irq: Add a new IRQF_ACK_BEFORE_UNMASK irq flagq

On Thu, 13 Mar 2014, Hans de Goede wrote:
> Hi,
> 
> On 03/13/2014 03:32 PM, Thomas Gleixner wrote:
> > On Thu, 13 Mar 2014, Sebastian Andrzej Siewior wrote:
> >> One side note: Since we need to specify IRQCHIP_EOI_THREADED and
> >> handle_fasteoi_late_irq() as the handler, would it be easily doable to use
> >> the handle_fasteoi_irq() handler and skip the EOI in the threaded mode?
> >> But if it creates a mess then leave it as it is.
> > 
> > Yeah, I was looking into that already. Patch below.
> > 
> > To resemble the late version you need to add IRQCHIP_EOI_THREADED and
> > IRQCHIP_EOI_IF_HANDLED to your irq chip.
> 
> Just gave this a review (in as far as I'm qualified to review core irq
> code), looks good and I agree this is an improvement over the previous
> version.
> 
> There is one behavioral change for irq-chips not setting the new
> IRQCHIP_EOI_THREADED flag hiding in there.
> 
> Before if the conditional unmask conditions were true for the
> ONESHOT case the code would do: "unmask; eoi", now it does
> "eoi; unmask" I believe the new behavior is more correct, but, since
> it is a behavior change I thought I should point this out.
> 
> I've also given this a test-run on sun4i and it works as advertised.
> 
> FWIW, this patch is:
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> Tested-by: Hans de Goede <hdegoede@...hat.com>
> 
> I'll include this in v3 of my irq-sun4i patch-set as it is a dependency
> there.

Sure, I split it up afterwards :)

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